Mad mo hated dogs. Most likely because the dogs would warn thier masters to take up defense when mo was on a slave raiding run...
Merchants relied on camels. Camels don't like dogs.
If you're a dog owner or were raised with dogs, you know that canines include butt sniffing in their greeting. Sort of a where ya been, whatcha ya been eatin’, gettin any lately thing among other things. You also know that as owners the dogs will embarrass you by sniffing the butts and crotches of human guests, especially if there are new and interesting smells.
Mo didn't what any dogs barking at that powerful goat aroma emanating from his pelvic region.
Then there's that protective thing dogs havecfor their young charges. Mo could silence the parents with threats before raping their pre-teen children. Loyal dogs not so much.
;>)